Side effect of Cortisone treatment

My uncle was being treated with a cortisone shot for bursitis or some other joint problem. After being given the injection, his doctor then gave him a cortisone pill. My uncle now is in a burn unit and is diagnosed with StevenJohnson Syndrome. All of his skin is peeling off after his entire body was completely covered with blisters.

Could his cortisone medication cause this type of body damage?

gwen duvall